﻿(function ($) {
    $.fn.jCarouselLite = function (o) {
        o = $.extend({
            btnPrev: null,
            btnNext: null,
            btnGo: null,
            mouseWheel: false,
            auto: null,
            hoverPause: true,

            speed: 200,
            easing: null,

            vertical: false,
            circular: true,
            visible: 3,
            start: 0,
            scroll: 1,

            beforeStart: null,
            afterEnd: null
        }, o || {});

        return this.each(function () {                           /* Returns the element collection. Chainable.*/

            var running = false, animCss = o.vertical ? "top" : "left", sizeCss = o.vertical ? "height" : "width";
            var div = $(this), ul = $("ul", div), tLi = $("li", ul), tl = tLi.size(), v = o.visible;
            

            if (tl > v) {/*Hoà: chỉ chạy khi số thẻ li lớn hơn số lượng hiển thị*/
                if (o.circular) {
                    ul.prepend(tLi.slice(tl - v - 1 + 1).clone())
              .append(tLi.slice(0, v).clone());
                    o.start += v;
                }
            }
            else {
                $(o.btnPrev).hide();
                $(o.btnNext).hide();
            }

            var li = $("li", ul), itemLength = li.size(), curr = o.start;
            div.css("visibility", "visible");

            li.css({ overflow: "hidden", float: o.vertical ? "none" : "left" });
            ul.css({ margin: "0", padding: "0", position: "relative", "list-style-type": "none", "z-index": "1" });
            div.css({ overflow: "hidden", position: "relative", "z-index": "2", left: "0px" });

            if (tl <= v) return false; /*Hoà: chỉ chạy khi số thẻ li lớn hơn số lượng hiển thị*/

            var liSize = o.vertical ? height(li) : width(li);   /* Full li size(incl margin)-Used for animation*/
            var ulSize = liSize * itemLength;                   /* size of full ul(total length, not just for the visible items)*/
            var divSize = liSize * v;                           /* size of entire div(total length for just the visible items)*/

            li.css({ width: li.width(), height: li.height() });
            ul.css(sizeCss, ulSize + "px").css(animCss, -(curr * liSize));

            div.css(sizeCss, divSize + "px");                     /* Width of the DIV. length of visible images*/

            if (o.btnPrev)
                $(o.btnPrev).click(function () {
                    return go(curr - o.scroll);
                });

            if (o.btnNext)
                $(o.btnNext).click(function () {
                    return go(curr + o.scroll);
                });

            if (o.btnGo)
                $.each(o.btnGo, function (i, val) {
                    $(val).click(function () {
                        return go(o.circular ? o.visible + i : i);
                    });
                });

            if (o.mouseWheel && div.mousewheel)
                div.mousewheel(function (e, d) {
                    return d > 0 ? go(curr - o.scroll) : go(curr + o.scroll);
                });



            var autoInterval;

            function startAuto() {
                stopAuto();
                autoInterval = setInterval(function () {
                    go(curr + o.scroll); /*chạy từ phải qua trái có giá trị +, chạy từ trái qua phải có giá trị -*/
                }, o.auto - o.speed);
            };

            function stopAuto() {
                clearInterval(autoInterval);
            };

            if (o.auto) {
                if (o.hoverPause) {
                    div.hover(function () { stopAuto(); }, function () { startAuto(); });
                }
                startAuto();
            };

            /*
            if(o.auto)
            setInterval(function() {
            go(curr+o.scroll);//chạy từ phải qua trái có giá trị +, chạy từ trái qua phải có giá trị -
            }, o.auto-o.speed);*/

            function vis() {
                return li.slice(curr).slice(0, v);
            };

            function go(to) {
                if (!running) {

                    if (o.beforeStart)
                        o.beforeStart.call(this, vis());

                    if (o.circular) {            /* If circular we are in first or last, then goto the other end*/
                        if (to <= o.start - v - 1) {           /* If first, then goto last*/
                            ul.css(animCss, -((itemLength - (v * 2)) * liSize) + "px");
                            /* If "scroll" > 1, then the "to" might not be equal to the condition; it can be lesser depending on the number of elements.*/
                            curr = to == o.start - v - 1 ? itemLength - (v * 2) - 1 : itemLength - (v * 2) - o.scroll;
                        } else if (to >= itemLength - v + 1) { // If last, then goto first
                            ul.css(animCss, -((v) * liSize) + "px");
                            /* If "scroll" > 1, then the "to" might not be equal to the condition; it can be greater depending on the number of elements.*/
                            curr = to == itemLength - v + 1 ? v + 1 : v + o.scroll;
                        } else curr = to;
                    } else {                    /* If non-circular and to points to first or last, we just return.*/
                        if (to < 0 || to > itemLength - v) return;
                        else curr = to;
                    }                           /* If neither overrides it, the curr will still be "to" and we can proceed.*/

                    running = true;

                    ul.animate(
                    animCss == "left" ? { left: -(curr * liSize)} : { top: -(curr * liSize) }, o.speed, o.easing,
                    function () {
                        if (o.afterEnd)
                            o.afterEnd.call(this, vis());
                        running = false;
                    }
                );
                    /* Disable buttons when the carousel reaches the last/first, and enable when not*/
                    if (!o.circular) {
                        $(o.btnPrev + "," + o.btnNext).removeClass("disabled");
                        $((curr - o.scroll < 0 && o.btnPrev)
                        ||
                       (curr + o.scroll > itemLength - v && o.btnNext)
                        ||
                       []
                     ).addClass("disabled");
                    }

                }
                return false;
            };
        });
    };

    function css(el, prop) {
        return parseInt($.css(el[0], prop)) || 0;
    };
    function width(el) {
        return el[0].offsetWidth + css(el, 'marginLeft') + css(el, 'marginRight');
    };
    function height(el) {
        return el[0].offsetHeight + css(el, 'marginTop') + css(el, 'marginBottom');
    };

})(jQuery);